Cementitious Waterproofing System| Durable Waterproofing for Concrete & Masonry 

Cementitious waterproofing is a cement-based coating system designed to protect concrete and masonry surfaces from water leakage, seepage, and dampness. 
This waterproofing method combines cement, sand, polymers, and waterproofing additives to form a rigid or flexible barrier that seals pores, cracks, and capillaries—ensuring long-term protection against water ingress. It is one of the most widely used waterproofing systems for basements, water tanks, bathrooms, roofs, retaining walls, and wet areas, valued for its ease of application, durability, and cost-effectiveness.

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Purpose & Key Functions 

The cementitious waterproofing system provides multiple layers of protection to concrete structures by

Preventing water seepage and leakage through porous concrete and masonry. 

Protecting against moisture, dampness, and corrosion. 

Enhancing structural durability by sealing micro-pores and cracks. 

Delivering seamless waterproofing for both internal and external wet areas. 

Composition of Cementitious Waterproofing Materials 

A high-quality cementitious waterproofing mix includes: 

Cement and graded fillers
Provide adhesion and compressive strength. 

Silica and quartz
Increase surface density and abrasion resistance. 

Liquid polymer or acrylic additive
Improves flexibility and crack-bridging performance. 

Hydrophobic waterproofing chemicals
Reduce water absorption and permeability. 

Mixing Types:

Single-component system
powder mixed with water.

Two-component system 
powder + liquid polymer mixed before application for enhanced performance. 

Step-by-Step Application Process 

Surface Preparation 

  • Clean and remove dust, oil, paint, and loose debris from the substrate. 
  • Repair cracks, joints, and honeycombs with polymer-modified mortar. 
  • Pre-wet the surface but ensure no standing water remains before coating. 

Mixing

  • Combine Part A (liquid polymer) with Part B (powder) using a slow-speed drill. 
  • Mix until a smooth, lump-free slurry is achieved. 
  • Avoid adding extra water beyond the manufacturer’s instructions. 

Application 

  • Apply the first coat using a brush or roller in a single direction. 
  • Allow to cure for 4–6 hours before applying the second coat perpendicular to the first. 
  • Reinforce corners, joints, and high-stress areas using fiber mesh or fabric tape between coats. 

Curing 

  • Air cure for 24 hours, then moist cure for 2–3 days with water spray or damp cloth. 
  • Protect coating from sunlight, wind, and rain during curing. 

Protection & Finishing 

  • For exposed surfaces, apply a protective screed, paint, or topcoat. 
  • For indoor wet areas, tiles can be directly fixed on the cured surface using tile adhesive. 

Applications

Roof decks and terraces 

Basements and retaining walls 

Water tanks and reservoirs 

Tunnels, culverts, and bridges 

Lift pits and sump pits 

Bathrooms, kitchens, and wet areas 

Podiums, balconies, and parking decks 

Advantages of Cementitious Waterproofing 

Easy to mix and apply (brush, roller, or spray)

Ideal for both internal and external waterproofing 

Excellent adhesion to concrete and masonry 

Resists both positive and negative water pressure 

Breathable coating – allows trapped moisture to escape 

Cost-effective, low-maintenance, and durable 

Quality Checks & Testing 

Visual inspection for pinholes or missed spots 

Water ponding test (24–48 hours) for roof or tank areas 

Adhesion test using the pull-off method for bond strength 

Thickness verification  typically 1–2 mm per coat 

Conclusion

The Cementitious Waterproofing System is a reliable, durable, and economical waterproofing solution for both positive and negative water pressure conditions. 
Its simple application process, strong adhesion, and long-lasting performance make it ideal for underground structures, water-retaining areas, and wet zones. 
When applied with proper surface preparation and curing, cementitious waterproofing ensures long-term protection against leakage, dampness, and structural deterioration—making it a trusted choice for construction projects across the UAE and GCC. 

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Frequently Asked Questions(FAQs)

Cementitious waterproofing is a cement-based coating system formulated to protect concrete and masonry structures from water intrusion, seepage, and dampness. 

It is widely used for waterproofing basements, underground structures, water tanks, reservoirs, swimming pools, bathrooms, wet areas, roof decks, balconies, and retaining walls.

The material typically consists of cement, graded fine aggregates (sand/fillers), polymers (often acrylics or liquid polymers), and specialized hydrophobic additives.

It creates an effective barrier that resists hydrostatic pressure and prevents moisture penetration.

It can be both. There are single-component (rigid) systems and two-component (flexible) systems that include a liquid polymer additive for enhanced flexibility and crack-bridging capability.

Yes, cementitious waterproofing is highly versatile and effective for both internal and external applications.

The substrate must be clean, free of dust, oil, paint, and loose debris. All cracks, joints, and surface defects must be repaired with a suitable polymer-modified mortar before the waterproofing slurry is applied.

Yes, particularly with two-component (flexible) systems. The inclusion of liquid polymers allows the cured membrane to accommodate minor structural movements and bridge hairline cracks.

Yes. Cementitious coatings provide an excellent base for direct tile application, especially in bathrooms and wet areas, as they offer strong adhesion.

Key advantages include ease of application, excellent adhesion to concrete and masonry, cost-effectiveness, durability, breathability, and resistance to positive and negative water pressure.

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